How to join with multiple tables?

Navigation
0

I have 4 tables they already have foreign key. 

aluno:
id
matricula
username
curso_id          // referencia a id_cursos da tabela cursos, coluna id_cursos.

cursos: 
id_cursos
nome_cursos

modulos:
id_modulos
nome_modulos
cursos_id         //faz referencia a tabela cursos, coluna id_cursos.

materias:
id_materias
nome_materias
modulos_id       // faz referencia a tabela modulos, coluna id_modulos.

in the student table you have 2 records: 

id | matricula | username | curso_id.<br>
1  | 12345678  | Usuario1 | 1 

id | matricula | username | curso_id.<br>
2  | 12344321  | Usuario2 | 2

I want to return all tables but only the columns that are related to the student column course_id 1, example, a student has a course, a course has several modules, a module has several fields, then has to return in this order, selected student makes Administration course, then returns the modules of the Administration course and the subjects of the modules.

    
asked by anonymous 04.11.2017 / 18:49

1 answer

1

There are two ways:

USING JOIN: 

SELECT * FROM ALUNO AS AL JOIN CURSO AS CS ON AL.curso_id = CS.id_cursos JOIN  MODULOS AS MD ON CS.id_cursos = MD.cursos_id JOIN MATERIAIS AS MT ON MT.modulos_id = MD.id_modulos

And using WHERE: 

SELECT * FROM ALUNO, CURSOS, MODULOS, MATERIAIS WHERE ALUNO.curso_id =  CURSOS.id_cursos AND MODULOS.cursos_id = CURSOS.id_cursos AND MATERIAIS.modulos_id = MODULOS.id_modulos
    
04.11.2017 / 19:45
Check changes in a table html Ordination by name and enrollment